An Eastern Bloc nation seeks to prevent the defection of Gerald Salzman, one of its key officials, to the U.S. Salzman's wife has already flown to the U.S. with forged papers. Sylvia Prince, who acts as a messenger and coordinator of espionage operations, has activated a sleeper agent who supposedly defected to the U.S. six years earlier. The plot of the conspirators is to kidnap Mrs. Salzman to force him to go back to his homeland. The FBI is on the case after a U.S. State Department official, who knows Salzman, is murdered. Erskine and Colby race to rescue Mrs. Salzman to ensure Salzman's defection takes place. (thetvdb.com)